Described is a coffee machine for preparing at least a first coffee beverage at a first brewing pressure and at least a second coffee beverage at a second brewing pressure, the second brewing pressure being higher than the first brewing pressure. A system may include a point-of-sale terminal or cash register which is connected to a check imager, a MICR reader, and a printer. The especially preferred phosphates are those of formula in which: R1 is a hydrogen atom, alkyl C1-C4, or CN; R is an aliphatic, cycloaliphatic or aryl radical containing from 1 to 10 carbon atoms and having a valence of n1; n is an integer from 1 to 5, preferably from 3 to 5. Then, the set of service level requirements will be mapped to a set of QoS parameters associated with a transport layer of the networked computing environment.